The simplest durable lesson here is this: the easiest stories to recall are not automatically the most probable ones. Core idea: Availability bias pushes recent or vivid information to the front of the mind, even when base rates say it should not dominate the decision. Why it matters: That matters in investing because headlines are optimized for recall, not for calibration. In real life: One spectacular blow-up can distort how you size an otherwise ordinary risk if you do not reset back to base-rate thinking. Common slip: The mistake is confusing mental accessibility with true frequency. Try this: If you had to teach this without jargon, what would you tell someone to monitor first? The point is not to memorize the label. The point is to know what variable is actually doing the work.